Fisher is even more at a disadvantage. Not only is he even more immobile than other gatherers, he also gathers way slower, which means he will lose more value with every fish stolen. Also there are really rare fish which only spawn once a week or so and it would be really unfair to get one of those stolen. That's like someone steals your savage loot for the week.
On the plus side fisher has lots of useless junk fish wich are cluttering the inventory, so you can probably reduce the odds that something valuable gets stolen.
But anyway, a bunch of gankers staying at the fishing spot at the time when a rare big fish spawns to knock out every fisher who happens to catch the fish is not a threat, that's destroying the whole fisher class.
Fisher has to deal with enough RNG and gameplay anyway, there is no need for additional threat. And arguably fishing should be relaxing anyway.
